Thread: Why…? Rings marks/scoring brass after FL resizing?

Originally Posted by 6x47

A die will only give you longitudinal scoring, not circumferential. DEF suspect it's chamber machining marks.

Greetings,
Another vote for a rough chamber. The case springs back a little after firing so you don't see marks on the case until you re size the case. The marks on the rom and in the rim recess are from the extractor. Some details and history of the rifle would help. Get a gunsmith to check and polish the chamber.
Regards Grandpamac.

Originally Posted by 6x47

A die will only give you longitudinal scoring, not circumferential. DEF suspect it's chamber machining marks.

Originally Posted by grandpamac

Greetings,
Another vote for a rough chamber. The case springs back a little after firing so you don't see marks on the case until you re size the case. The marks on the rom and in the rim recess are from the extractor. Some details and history of the rifle would help. Get a gunsmith to check and polish the chamber.
Regards Grandpamac.

This and this above^^^^

Even if your die does have machining marks in it if it was causing the marks on the brass they would be lenghtwise on the case.
Got a photo of a new unfired case that has been sized?
Photo inside die?
Photo inside chamber?

Really looks to me like you have a rough chamber and sizing your brass is highlighting all the highpoints in the brass once it is formed in the chamber.

Rough chamber

if you have the LEE case trimmer set and use your cordless drill to do the deburring etc...poke a case in the holder end ,put in drill and give it a polish using a bit of choreboy cloth or fine steel wool, this will make it all nice n shiney with tiny tiny wee rings around case...then resize it and let us have another look... that SHOULD show up whats the issue....and as others have said the die could have crap in it from factory,,,drop it in ice cream container and cover with 2 stroke petrol!!!! shock horror,meths or white spirits or thinners might be cheaper.....get cotton bud and give inside a dung out,remove spnindle and give the bulgy bit/expander ball a polish using the drill and fine wet n dry then steel wool while you are at it,will make it slip in and out like a well greased PRI#* up a slack fan*# makes life much easier and not so hard on your gritted teeth when resizing.

I'd be giving the die a really good clean out before sending it back. I would think it is more likely to be chamber machining marks imprinting on the case that are then highlighted when the case is forced into the die.

Right not what I thought then good! Next Will be interested in what the issue iswhen you get to the bottom of it

Originally Posted by GuyDowding

Hey, just put some new and once fired brass through die which had no blemishes or ring in it ect before hand but once re sized can see them straight away.. i can see machining rings on inside of die and for whatever reason i seam to need to use a fair bit if pressure with my press..can be easy to jam cases in it!


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I'd be inclined to have a closer look at the die before sending it back. I'd think it is more likely to be chamber machining marks imprinting on the case and then being highlighted when the case is forced through the die.

Has this always been the norm. If not what are you doing differently.

Originally Posted by Micky Duck

... give the bulgy bit/expander ball a polish using the drill and fine wet n dry then steel wool while you are at it..

I'm not sure what relevance this has to the outside-of-case marks. Also, from what I've seen of the smoothness of most expander balls, this may roughen up the inside of the neck, not improve it. At the very least, you'll be then guessing as to how much the case neck diameter has been changed from this arbitrary modification.

Originally Posted by 6x47

I'm not sure what relevance this has to the outside-of-case marks. Also, from what I've seen of the smoothness of most expander balls, this may roughen up the inside of the neck, not improve it. At the very least, you'll be then guessing as to how much the case neck diameter has been changed from this arbitrary modification.

absolutely nothing to do with case marks...EVERYTHING to do with ease of slipping expander ball in and out of case...the OP said has big effort when using press...
by using fine sandpaper to take the sharp edges off expander ball and smooth it off/polish it without making it smaller the ease of use is increased by a HUGE amount if the expander ball was a tad on rough side to begin with....

seems your experience looking at balls differs from mine....

Thanks all, have played around a bit with unfired, once fired, different press, different lube all with same results of getting these ring marks but who knows ??



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Originally Posted by Micky Duck

seems your experience looking at balls differs from mine....

Clearly ;-)
I'm only going on my experiences with 30+ factory die sets. If upstrokes were gritty, it almost invariably pointed to inadequate lubrication as neck walls aren't thick unlike bodies/webs. It's pretty rare I use any expander balls these days.

The OP didn't mention excessive force needed on the up-stroke so I assumed he meant the usual downstroke force.

Originally Posted by GuyDowding

Thanks all, have played around a bit with unfired, once fired, different press, different lube all with same results of getting these ring marks but who knows ??



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That die only half made(rough as guts)

Yep, total shocker. What brand??